code: def close(self):
      if self._data is not None:
          self._data.close()
          self._data = None
  
imports: import numpy
  import os
  import json
  import h5py
  from tqdm import tqdm
  from torchmeta.utils.data import Dataset, ClassDataset, CombinationMetaDataset
  from torchmeta.datasets.utils import get_asset
label_desc: Use image node_id 10 for calling the BachClassDataset obj's underlying member method code with example usage: obj.close() without return types